CN106013042B - A kind of soft soil foundation reinforcing method and the pipe of reinforcing ram - Google Patents
A kind of soft soil foundation reinforcing method and the pipe of reinforcing ram Download PDFInfo
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- CN106013042B CN106013042B CN201610438342.0A CN201610438342A CN106013042B CN 106013042 B CN106013042 B CN 106013042B CN 201610438342 A CN201610438342 A CN 201610438342A CN 106013042 B CN106013042 B CN 106013042B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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- Agronomy & Crop Science (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The present invention relates to a kind of soft soil foundation reinforcing methods and the pipe of reinforcing to ram, by the way that pipe will be rammed in conjunction with vibration hammer, ramming pipe two sides, vacuum dehydration pipe is set, feed inlet is set on ramming pipe, rams pipe built-in pipe hammer ram, so that pipe hammer ram is lifted by crane and is fallen off using the opening and closing of pincerlike detacher, reaches required tamping energy and reinforcement criteria；It during ramming, draws water when ramming, achievees the purpose that super quiet pore pressure after rapid dispersion rammer；To the current-formed silt soil that can not be rammed, the preferable soil of soil property is injected by feed inlet and is replaced, the bearing capacity index of reinforced treated place reaches ideal compactness.Construction procedure of the present invention is simple, the period is short, at low cost, by compacting from deep to shallow, the bearing eigenvalue of foundation soil in reinforcing scope can be made to significantly improve, change the mechanics index of physics of weak soil significantly；Consolidation process can be carried out to the weak soil of any property by the displacement of control tamping energy and required thickness, reinforce thickness up to 20~30m.
Description
Technical field
The present invention relates to a kind of soft soil foundation reinforcing methods and the pipe of reinforcing to ram, suitable for not being able to satisfy design to place
Required bearing capacity and the processing of the weak soil soil stabilization of compactness, possession base processing technology field.
Background technique
Currently, reinforced soft soil ground is widely applied strong tamping technology, passes through heavy tamping energy pair by dewatering measure
The soil body rams procedure coercion compression or hits close, can reach the rising of the discharge of gas and pore water pressure in the soil body；Cause the soil body
Liquefaction or soil structures are destroyed；Soil mass crack development is generated, the infiltration coefficient of the soil body is changed, pore pressure disappears with after rammer
It dissipates, soil strength improves, and thixotroping recovery reaches consolidation.
In a large amount of soft soil foundation dynamic consolidation construction case, the principle of " hit multipass less, first light rear weight, add energy step by step " is soft
Native foundation dynamic consolidation successful application is laid a good foundation；According to tamping energy and reinforcement depth and the relationship of level of ground water, soft soil foundation
Strong rammer effective reinforcement depth is usually the 1/4 of tamping energy, it is contemplated that the drawdown of level of ground water adds 1~2m to be effectively to reinforce deeply
Degree.
With the development of China's manufacturing industry, determine that the super-tonnage crane of strong rammer tamping energy is applied to the strong of high-energy
Construction is rammed, maximum tamping energy can reach 12000KN.m at present, but show that soft soil foundation uses through high-energy dynamic compaction Construction practices
The reinforcement depth of the tamping energy of high-energy, weak soil is not extended, is easily caused " spring soil " instead, is caused soft soil foundation
It can not restore foundation strength after rammer, or even destroy soil structures.To find out its cause, the soil condition and level of ground water of soft soil foundation
Every thixotroping mechanism of weak soil is acted on hammer ram and heavy tamping energy rams procedure coercion compression to the soil body or to hit its close relationship non-
It is often complicated, it is not to rely solely on improving tamping energy to reach effective reinforcement depth, the maximum tamping energy that can be born in weak soil,
Be exactly optimum tamping energy, it is necessary to just right, punch-through can then be generated by crossing, formed in " spring soil " engineering practice it is vivid general
This likens " battering down " to.
Shallow layer reinforcement is rested on to the application of strong rammer technique always in the reinforcement depth of soft soil foundation strong rammer as a result, generally
Use strong rammer effective reinforcement depth for 4~6m, by carrying out strong rammer after setting dewatering measure, effective reinforcement depth also with regard to 6~
8m uses Dewatering dynamic compaction in the preferable soft soil foundation of soil structure, and tamping energy is in the practice of 12000KN.m, and maximum is effectively
Reinforcement depth reaches 14m.But its cost is high, work efficiency is slow, can not be suitable for being widely applied.
In order to achieve the purpose that weak soil deep-layer reinforcing, engineers and technicians use deep layer explosion, backfill Building wood after explosion
Then material uses strong rammer technique, final result namely replaces deep layer weak soil, can not still solve the difficulty of deep-layer reinforcing
Topic.
The effective reinforcement depth of strong rammer is always the main problem for perplexing the deep-layer reinforcing of soft soil foundation, engineers and technicians
By being built into steel pipe in required depth, strong rammer, but the deep layer that chance silt soil or level of ground water fill, warp are carried out by hanging hammer ram
It tests soil strength to improve seldom, and soil body recovery time is longer, such as backfills its effect after the live preferable earth material of soil property is rammed
It is not obvious, key is that tamping point water content is excessively high, directly affects the consolidation effect of strong rammer.
In conclusion soft soil foundation uses strong rammer technique, reinforcement depth is limited；Even if using high-energy dynamic compaction, due at
This height, it is long in time limit, and easily batter down the soil body；Strong rammer is carried out to deep layer by being placed in hang to ram after steel pipe in weak soil, due to underground
Water level and water content of soil are excessively high, and soil strength improves few after rammer, and effect is not obvious, and recovery time is long.
Summary of the invention
In order to solve the above technical problems, the object of the present invention is to provide a kind of soft soil foundation reinforcing method and the pipes of reinforcing
It rams, using the construction method vacuumized after strong rammer, rammer in pipe, convection current modeling shape weak soil, which replaces by part and is aided with precipitation, is arranged
It applies, to eliminate the purpose of settlement after construction up to quickly changing weak soil intensity, quickly improving foundation bearing capacity.
Soft soil foundation reinforcing method of the invention, comprising steps of
1) will the tip made of steel pipe, ram pipe and be assembled into pipe rammer with vibration hammer, pincerlike detacher, pipe hammer ram, managed ramming
Two sides arrange vacuum dehydration pipe, vacuum pump is connect with vacuum dehydration pipe, then hangs over pipe rammer on the suspension hook of crane；
2) peripheral seal wall is added at 3~5m outside the region sideline that need to be reinforced；
3) tube well dewatering network is arranged in the region that need to be reinforced；
4) tamping point is arranged and positions, pipe connects vacuum dehydration pipe, and riser hammer ram after being rammed into soil, carries out to bottom weak soil
After light rammer, promotes rammer pipe and carry out a rammer, while vacuum is drawn water；
5) dynamic compaction is carried out to the shallow-layer for the soft soil foundation that need to be reinforced；
6) after the completion of a tamping point, displacement carries out the construction of next tamping point.
Further, the diameter and length for ramming pipe are determined, with vibration according to soil condition and reinforcement depth in the step 4)
It after dynamic hammer connection, is promoted and rams pipe, tip is arranged on tamping point, pipe sleeve will be rammed on the shoe of tip, be then turned on vibration hammer, it will
It rams pipe and squeezes into required depth, unlatching vacuum pump draws water and tube used for bottom pouring hammer ram is rammed, concrete operation step are as follows:
41) pipe hammer ram is sling by pincer detacher, pipe hammer ram enters in rammer pipe after depth needed for arrival, gently rams 2~3 and hits
Vibration hammer is opened afterwards lifts rammer pipe；
42) it according to soil condition, determines that vibration hammer promotes the distance for ramming pipe, rams after pipe is promoted and close vibration hammer, rammed by pipe
Hammer carries out a rammer, rams number and is determined according to soil condition, the last straw ramming volume controls within the scope of 10cm；
43) it repeats step 42) and promotes rammer pipe step by step, compacting is until earth's surface step by step；
44) during ramming pipe promotion or ramming, vacuum is kept to draw water.
Further, when ramming silt soil or clay, preferable soil property progress can be added by ramming the feed inlet of pipe
Displacement compacting.
Further, peripheral seal wall is formed by stirring spray stake, stake and stake being carried out to overlap joint in the step 2), stake enters
Native depth according to need reinforcement depth determine.
Further, tube well dewatering network is arranged using PVC ripple chimney filter in the step 3), in PVC ripple chimney filter pipe
Filter opening is arranged in wall, and filter opening presses 0.2~0.5m spacing etc. point arrangement from top to bottom, and filter opening wraps up 2~3 after being provided with outside tube wall
Layer 80 mesh strainer, pipe well embedded depth according to need reinforcement depth determine.
Further, tamping point arrangement grid according to geological conditions and rams pipe diameter and determines, to the biggish soil property of infiltration coefficient,
Tamping point grid is arranged by the equilateral triangle that side length is 4m；To the lesser soil property of infiltration coefficient, the equilateral triangle for being 2m by side length
Shape arranges tamping point grid.
The pipe of reinforced soft soil ground of the invention rams, de- the tip made of steel pipe, rammer pipe and vibration hammer, pincer
Hook device, the assembling of pipe hammer ram are constituted, and the two sides for ramming pipe are disposed with vacuum dehydration pipe, and the pipe that rams is set on the outer wall of nozzle
It is equipped with the feed inlet being connected to inside the rammer pipe；It is equipped with water filter in the vacuum dehydration pipe, is enclosed with 2 on the water filter
The nylon leaching net of~3 layers of 100 mesh, is also arranged with housing on the water filter, described outer to put on equipped with several through-holes.
Further, the vibration hammer is connected on the nozzle for ramming pipe, and the vibration hammer includes absorbing frame and vibration
Device is connected between the absorbing frame and vibrator by vibrator spring, and the absorbing frame is equipped with pulley and crampon, institute
State pulley by wear connect steel cable with it is described pincer detacher connect.
Further, the pincerlike detacher includes the U-shaped shackle connecting with steel cable, and the shackle end is connected with shackle
It sells, semicircular pincerlike tripping gear there are two connections on the shackle pin, is arranged on one of them described pincerlike tripping gear
Control steel cable tightens/loosens, opens the two pincerlike tripping gears or the fixed points of closure, it is described unload to buckle also be covered with cone
Shape cover.
Further, the pipe hammer ram includes the first hammer body and the second hammer body connected from top to bottom, first hammer body
End is equipped with several ventholes and the hook for connecting with the pincerlike tripping gear, the diameter of second hammer body are small
In the diameter of first hammer body to be positioned to the pipe hammer ram.
According to the above aspect of the present invention, the present invention is aided with peripheral seal and pipe well large-area precipitation method by pipe rammer to reach weak soil
The purpose of ground deep-layer reinforcing, has at least the following advantages:
1, implement simply, it is applied widely
It is rammed by pipe to the method for needing the soft soil foundation of reinforcing area to carry out pipe rammer, deep soil Binding in vivo water is forced to ram
It is discharged the soil body under the effect of hitting, the vacuum dehydration pipe discharge of tube wall is arranged on, had not only reached deep layer Dewatering dynamic compaction, but also can quickly disappear
The super quiet pore pressure of the soil body after ramming is dissipated, has established solid foundation to accelerate soil stabilization；The soil property small to interlayer soil infiltration coefficient
By replacing preferable soil property, achievees the effect that change soil nature, solve existing traditional handicraft soft soil foundation deep-layer reinforcing not
Foot；Method for strengthening, which is rammed, by downcomer is applicable not only to coefficient of permeability K during the consolidation process to large-area soft ground
The soil layer of the low-permeabilities such as the soil property of≤0.1m/d such as very soft sill clay provides one kind for the solid reinforcement of low-permeability
Completely new reinforcing and processing method；But also it is suitable for the soil properties such as the preferable soil property of infiltration coefficient such as hydraulic fill sand, interlayer flour sand；Through this
The characteristic load bearing capacity of the soil body can significantly improve after technique consolidation process.
2, the construction time is short, and speed is fast, at low cost, and cost performance is high
Directly by deep layer Dewatering dynamic compaction, deep-layer reinforcing equipment and technology are initiated, can be rammed according to design requirement by changing
Technical indicator can be reached by hitting, its settlement after construction of reinforcement means and the rate of settling from deep to shallow does not become with the variation of working load
Change, the influence of settlement after construction and the rate of settling can be substantially eliminated；Due to being rammed by precipitation combination pipe, consolidation time is short, reinforces speed
Degree is fast, and overall cost is low, is that other techniques are unable to reach.
3, deep layer precipitation, high-efficient, consolidation effect is obvious
It is rammed in Precipitation Process in the invention in pipe, is aided with precipitation envelope wall, tube well dewatering and shallow-layer dynamic consolidation, makes the soil body
Mechanics index of physics is greatly changed, especially the consolidation process to interlayer soil, by displaced method, to make to add
Gu the soil body forms integrated depth hard formation；Its reinforcement depth can be controlled by ramming the placed-depth of pipe, convenient for the prison of work progress
Superintend and direct and manage, achieve the effect that reinforce it is closely knit, while for reduce settlement after construction, improve soft soil foundation bearing capacity established it is solid
Basis, therefore, this method is suitable for the consolidation process of road, place, underground piping etc..
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention and the accompanying drawings.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is the structural schematic diagram that pipe and tip are rammed in the present invention；
Fig. 3 is vibration hammer pulley attachment structure schematic diagram in the present invention；
Fig. 4 is the structural schematic diagram of pincerlike detacher in the present invention；
Fig. 5 is the structural schematic diagram of pipe hammer ram in the present invention；
Fig. 6 is pipe hammer ram top plane view.
In figure: 1, crampon, 2, vibration hammer, 21, pulley, 22, absorbing frame, 23, spring, 24, vibrator, 3, pincerlike de-
Hook device, 31, steel cable, 32, cone-shaped hood, 33, shackle, 34, shackle pin, 35, pincerlike tripping gear, 36, fixed point, 4, pipe hammer ram,
41, venthole, 42, hook, the 43, first hammer body, the 44, second hammer body, 5, rammer pipe, 51, nozzle, 52, feed inlet, 53, vacuum suction
Water pipe, 54, water filter, 55, housing, 56, through-hole, 57, rammer pipe reinforcing rib, 6, tip, 61, tip top, 62 tip bottoms.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
As shown in Figures 1 to 6, the pipe of reinforced soft soil ground of the invention rams, and the tip 6 made of steel pipe, rams
Pipe 5 and vibration hammer 2, pincerlike detacher 3, the assembling of pipe hammer ram 4 are constituted.
It rams pipe 5 to be made of steel pipe, arranges vacuum dehydration pipe 53 in the two sides of pipe shaft outer wall, 53 lower part of vacuum dehydration pipe is set
Water filter 54 is set, and wraps up 2~3 layers with the nylon leaching net of 100 mesh；For the abrasion for preventing water filter 54 in work progress, filtering
Water filter housing 55 is set on hydrophone 54, and the holes drilled through 56 (aperture 0.05cm) on 54 housing 55 of water filter sinks to institute when ramming pipe 5
It needs depth, open in vacuum pump progress vacuum-dewatering work progress and under conditions of vacuum is drawn water during ramming, because of vacuum
Suction function, in the soil body a large amount of Free water and after ramming the intracorporal pore pressure water of soil by housing 55, nylon leaching net through drainage
Device 54 enters vacuum dehydration pipe 53, and the soil body is discharged by vacuum dehydration pipe 53.5 nozzle 51 of pipe is being rammed, lower end also sets up charging
Mouth 52, in work progress, generation " cavity " after clay is rammed can not be tamped or meet by meeting current-formed silt, then can pass through the charging
Mouth pours into the preferable earth material in scene, achievees the effect that displacement, to ensure that the invention can be suitably used for different thickness difference soil properties
Consolidation process.
Ram 5 bottom of pipe be provided with ram pipe reinforcing rib 57, avoid ramming being to damage tip 6, tip top 61 it is straight
Diameter is the internal diameter for ramming pipe 5, so that tip 6 is inserted in and rams in pipe 5, and tip bottom 62 is that tip buries portion, can be according to pipe tamping point before construction
Arrangement grid, bury tip portion is pre-buried, when construction need only will ram pipe sleeve and can open vibration hammer on tip beats pipe is rammed
Enter required depth.Its effect is that the stifled modeling shape soil of stream absolutely enters in rammer pipe, and mitigates the soil body to the friction of steel pipe.Tip belongs to one
Secondary property buries when reaching certain depth and carrying out strong rammer with steel pipe, under the effect of pipe hammer ram, is rammed into the soil body, can use certain proportion
Concrete, or be made with other materials.
The nozzle 51 for ramming pipe 5 connects vibration hammer 2, and vibration hammer is using vibration hammer selection root electronic or hydraulic, that pipe rams
It is determined according to soil condition and the diameter for ramming pipe, according to theoretical calculation: soil can not only be reduced to rammer pipe by improving excited frequency
Side frictional resistance, and the acceleration of motion of rammer pipe can be more effectively improved than improving amplitude, to improve the speed of immersed tube.
But excited frequency is excessively high to cause power to increase excessively, therefore, should also comprehensively consider when determining excited frequency.Vibration hammer connection
On the nozzle for ramming pipe, vibration hammer includes absorbing frame 22 and vibrator 24, passes through vibrator between absorbing frame 22 and vibrator 24
Spring 23 connects, and absorbing frame 22 is equipped with pulley 21 and crampon 1, and pulley 21 connects steel cable 31 and pincerlike detacher 3 by wearing
Connection, hoisting winding forward or reverse, make pincerlike detacher 3 or upper or lower movement by the steel cable.
Strong rammer uses traditional freely falling body form, the main safety for considering equipment and consolidation effect, freely falling body side
Formula can reach the effect of thing half is crossed times compared with linking up with strong rammer, due to the freely falling body mode of pipe hammer ram 4 be ram manage in realize
, with existing strong rammer difference be exactly the hammer of pipe hammer ram 4 and hook is to realize, therefore, suspension hook and hammer handle in rammer pipe 5
Combination using pincerlike mode, and its opening and closing is controlled by steel cable.Pincerlike detacher 3 passes through 31 joining shackle 33 of steel cable, shackle
Two semicircular pincerlike tripping gears 35 are installed at pin 34, are provided with control on the wherein pincerlike tripping gear of one piece of semicircle
The fixed point 36 of steel cable can make pincerlike tripping gear 35 open or be closed, to make pipe hammer ram by tightening or loosening the steel cable
Disengagement steel cable or lift pipe hammer ram.Pincerlike detacher also sets up a cone-shaped hood 32, and effect is to protect pincerlike detacher 3 and pipe
The junction of hammer ram 4, while also there is the guiding role for making pincerlike detacher 3 grab the hook of pipe hammer ram 4 42.
Pipe hammer ram 4 is made of cast steel, and diameter, which is less than, rams pipe 10cm, to guarantee that pipe hammer ram does not touch during free-falling
It hits and rams pipe 5, influence its tamping energy.The determination of tamping energy according to: hammer weight × height determine.Pipe hammer ram top is provided with venthole
41, effect is that the soil body is to the suction of pipe hammer ram after reducing rammer, and the number of venthole is determining according to the diameter of pipe hammer ram, generally
2~4；First hammer body 43 of pipe hammer ram is provided with hook 42, hook 42 and the connection of pincerlike tripping gear are controlled by steel cable,
When pincerlike detacher opens, pipe hammer ram falls automatically not by the control of pincerlike detacher, rams to the soil body；Pipe rams
The 44 hammer ram position portion of the second hammer body of hammer, effect is can to prevent from hammering into shape partially when weak soil soil property is rammed, when to weak soil soil
When body is rammed, the second hammer body 44 is introduced into the soil body and squeezes weak soil, and then the first hammer body 43 is again in compacted soil
It is rammed on body, quickly grabs pipe hammer ram for detacher pincerlike after rammer and create conditions.
It is rammed using above-mentioned pipe as follows to the method for reinforced soft soil ground:
1, it positions: according to soil condition and reinforcement depth, determining the diameter and length for ramming pipe, after being connect with vibration hammer, mention
It rises and rams pipe, tip is arranged on tamping point, pipe sleeve will be rammed on the shoe of tip, be then turned on vibration hammer, will ram needed for pipe squeezes into
Depth.
2, vacuum dehydration pipe is connected, connects pincerlike detacher, pincerlike detacher using lifting pulley increased on vibration hammer
Sling pipe hammer ram.
21, the vacuum dehydration pipe of pipe two sides is rammed in connection, and is connect with vacuum pump by soft rubber tube, and confirmation is tightly connected
Afterwards, vacuum pump is opened to draw water；
22, at the same time, lifting pulley connects pincerlike detacher, slings rammer pipe, the merging of pipe hammer ram by pincerlike detacher
After depth needed for reaching in rammer pipe, gently rammer 2~3 hits (pincerlike detacher is kept with pipe hammer ram under conditions of connection status) and opens afterwards
Vibration hammer, vibration lift rammer pipe, and pipe hammer ram is in closed state in tube bottom, pincerlike detacher at this time, are hooked in the hook handle of pipe hammer ram
On；
23, vibration hammer proposes the distance for ramming pipe, is determined according to soil condition, is up to 2~3m of promotion, closes vibration hammer, stops
It is only promoted, the distance of slinging of pipe hammer ram is 2~3m, slings distance by the control steel cable control of pincerlike detacher, carries out a rammer, ram
Number determines that the last straw ramming volume is controlled in 10cm range according to soil condition；
24, pipe is rammed by mentioning step by step, the method tamped step by step, until earth's surface.During practical pipe rams, such as silt soil
Layer, pipe ram the principle that tamping energy grasps " hitting weight after mentioning less, being first light less ", also the preferable soil property in scene can be added in feed inlet and carry out
Displacement compacting generates " cavity " phenomenon for argillic horizon, then the preferable soil property in scene can also be added in feed inlet, be tamped；
25, during mentioning rammer pipe or ramming, vacuum dehydration is kept, the water content of the soil body, Er Qiejia can be not only reduced
The pore pressure dissipation of the soil body, reaches required consolidation effect after fast rammer；
26, after the completion of pipe tamping point, the construction for carrying out next pipe tamping point can be shifted；
27, pipe tamping point arrangement grid is determined according to geological conditions and rammer pipe diameter, to the biggish soil property of infiltration coefficient, is layouted
Grid is that 4.0m equilateral triangle can then be arranged the lesser soil property of infiltration coefficient by 2.0m equilateral triangle；
28, such as muck soil body construction can open vacuum after rammer pipe is driven into required depth under the action of vibration hammer
Pumping takes the underground water of subjacent bed certain depth, while the preferable soil property in scene is put into feed inlet, notices that, in charging, pipe rams
Hammer must be promoted to nozzle, be rammed after allowing the earth material of addition to pour into required position；
29, such as argillic horizon, " cavity " phenomenon can be then generated after rammer, when finding the situation, pipe hammer ram is promoted to nozzle,
Soil property is put into feed inlet, earth material is rammed after pouring into required position.
3, dewatering measure is assisted
31, it is influenced to ensure to need reinforcing area not by peripheral water, further increases downcomer and ram method for strengthening effect, needed
Peripheral seal wall is added outside reinforcing area sideline at 3~5m.
The method that peripheral seal wall passes through Dust Deep Stir stake, stake diameter 70cm, stake and stake overlap 20cm, stake embedded depth root
According to needing reinforcement depth to determine, wherein it should be specifically noted that need the infiltration coefficient of reinforcement depth range intraformational bed soil, to infiltration coefficient compared with
Big soil layer needs stir to spray more more.Stirring material is available locally, and generally uses mud or clay, and wherein yellow clay is best, incorporation
Amount is 15%~20%.
32, reinforcing area construction efficiency and construction quality are needed in order to improve simultaneously, needs reinforcing area that can arrange certain pipe
Well precipitation network, precipitation pipe well use PVC ripple chimney filter, and caliber is 25cm~60cm, are arranged in PVC ripple chimney filter tube wall and filter
Hole, filter opening press spacing of 0.2m~0.5 etc. point arrangement from top to bottom, and filter opening wraps up the nylon filter of 80 mesh outside tube wall after being provided with
2~3 layers of net, or generation is arranged with geotechnique.Tubes welding can be determining according to the infiltration coefficient of geological conditions and soil, and generally 15m ×
15m, pipe well bury deep according to needing reinforcement depth to determine.
Tube well dewatering releases weight principle using waterpower, can quick lowering of watertable, and drawdown is buried depth up to pipe well
The 2/3 of degree.As large area soft foundation processing, it is applied very extensive, and effect is fairly obvious.Reach reduction by tube well dewatering
Level of ground water rams quickly drawing water for method for strengthening for downcomer and creates conditions.
4, shallow-layer dynamic compaction
The soft soil foundation that need to be reinforced rams added peripheral seal, pipe well network precipitation ancillary measure meeting downcomer
Under, deep soil its soil bearing capacity characteristic value under conditions of pipe is rammed and drawn water significantly improves, and level of ground water is then reduced to pipe
The 2/3 of well embedded depth.On this basis, shallow-layer is aided with dynamic consolidation again, and soil bearing capacity characteristic value not only can be improved, more may be used
Further eliminate settlement after construction, relative settlement and the rate of settling.
The above is only a preferred embodiment of the present invention, it is not intended to restrict the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is several improvement and
Modification, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of soft soil foundation reinforcing method, it is characterised in that comprising steps of
1) will the tip made of steel pipe, ram pipe and be assembled into pipe rammer with vibration hammer, pincerlike detacher, pipe hammer ram, ramming the two of pipe
Vacuum dehydration pipe is arranged in side, and vacuum pump is connect with vacuum dehydration pipe, then rams pipe on the suspension hook for hanging over crane；
2) peripheral seal wall is added at 3~5m outside the region sideline that need to be reinforced；
3) tube well dewatering network is arranged in the region that need to be reinforced；
4) tamping point is arranged and positions, pipe connects vacuum dehydration pipe, and riser hammer ram after being rammed into soil, gently rammed to bottom weak soil
Afterwards, it promotes rammer pipe and carries out a rammer, while vacuum is drawn water；
5) dynamic compaction is carried out to the shallow-layer for the soft soil foundation that need to be reinforced；
6) after the completion of a tamping point, displacement carries out the construction of next tamping point；
According to soil condition and reinforcement depth in the step 4), determines the diameter and length for ramming pipe, after being connect with vibration hammer, mention
It rises and rams pipe, tip is arranged on tamping point, pipe sleeve will be rammed on the shoe of tip, be then turned on vibration hammer, will ram needed for pipe squeezes into
Depth, unlatching vacuum pump draws water and tube used for bottom pouring hammer ram is rammed, concrete operation step are as follows:
41) pipe hammer ram is sling by pincer detacher, pipe hammer ram, which enters, to be rammed in pipe after depth needed for arrival, and gently rammer 2~3 is opened after hitting
It opens vibration hammer and lifts rammer pipe；
42) according to soil condition, determine that vibration hammer promotes the distance for ramming pipe, ram after pipe is promoted and close vibration hammer, by pipe hammer ram into
Row point rams, and rams number and is determined according to soil condition, the last straw ramming volume controls within the scope of 10cm；
43) it repeats step 42) and promotes rammer pipe step by step, compacting is until earth's surface step by step；
44) during ramming pipe promotion or ramming, vacuum is kept to draw water.
2. soft soil foundation reinforcing method according to claim 1, it is characterised in that: when ramming silt soil or clay, energy
Enough feed inlets by ramming pipe are added preferable soil property and carry out displacement compacting.
3. soft soil foundation reinforcing method according to claim 1, it is characterised in that: pass through stirring spray in the step 2)
Stake and stake are carried out overlap joint and form peripheral seal wall by stake, and stake embedded depth is according to needing reinforcement depth determination.
4. soft soil foundation reinforcing method according to claim 1, it is characterised in that: use PVC ripple in the step 3)
Chimney filter arranges tube well dewatering network, filter opening is arranged in PVC ripple chimney filter tube wall, filter opening presses 0.2~0.5m spacing etc. from top to bottom
Distribution is set, and filter opening wraps up the strainer of 2~3 layers of 80 mesh outside tube wall after being provided with, pipe well embedded depth is according to need to reinforce depth
Degree determines.
5. soft soil foundation reinforcing method according to claim 1, it is characterised in that: tamping point arranges grid according to geological conditions
And ram pipe diameter and determine, to the biggish soil property of infiltration coefficient, tamping point grid is arranged by the equilateral triangle that side length is 4m；To infiltration
The lesser soil property of coefficient arranges tamping point grid by the equilateral triangle that side length is 2m.
6. a kind of pipe of reinforced soft soil ground used by soft soil foundation reinforcing method as described in claim 1 rams, special
Sign is: it is made up of the tip made of steel pipe, rammer pipe and vibration hammer, pincerlike detacher, the assembling of pipe hammer ram, the rammer pipe
Two sides are disposed with vacuum dehydration pipe, described to ram the charging for managing and being provided on the outer wall of nozzle and being connected to inside the rammer pipe
Mouthful；It is equipped with water filter in the vacuum dehydration pipe, the nylon leaching net of 2~3 layers of 100 mesh is enclosed on the water filter, it is described
Housing is also arranged on water filter, it is described to put on outside equipped with several through-holes；
The vibration hammer is connected on the nozzle for ramming pipe, and the vibration hammer includes absorbing frame and vibrator, the absorbing frame
It is connect between vibrator by vibrator spring, the absorbing frame is equipped with pulley and crampon, and the pulley is by wearing
Steel cable is connect to connect with the pincerlike detacher；
The pincer detacher includes the U-shaped shackle connecting with steel cable, and the shackle end is connected with shackle pin, the shackle pin
Upper connection there are two semicircular pincerlike tripping gear, setting control steel cable tightening on one of them described pincerlike tripping gear/
Loosen, open the two pincerlike tripping gears or the fixed points of closure, it is described unload to buckle also be covered with cone-shaped hood.
7. the pipe of reinforced soft soil ground according to claim 6 rams, it is characterised in that: the pipe hammer ram include from upper and
The first hammer body and the second hammer body of lower connection, first hammer body end are equipped with several ventholes and are used for and the pincer
The hook of tripping gear connection, the diameter of second hammer body are less than the diameter of first hammer body with fixed to the pipe hammer ram
Position.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106978801B (en) * | 2017-03-22 | 2023-06-06 | 江苏澄工科技有限公司 | Multifunctional vibration air compression pipe and construction method for reinforcing soft soil foundation by using same |
| CN107100182A (en) * | 2017-05-17 | 2017-08-29 | 福建岩土工程勘察研究院 | Soft foundation cluster type layering precipitation no-arbitrary pricing pipe rams system and its construction method |
| CN111827247A (en) * | 2019-04-15 | 2020-10-27 | 江苏澄工科技有限公司 | Method for reinforcing soft foundation |
| CN117804943B (en) * | 2024-02-29 | 2024-05-10 | 湖南百舸水利建设股份有限公司 | Cement soil penetration test method and detection device thereof |
| CN118029362B (en) * | 2024-04-11 | 2024-06-11 | 中衡设计集团工程咨询有限公司 | Dynamic compaction control system and control method based on dynamic compaction engineering construction |
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